diff --git a/src/main/fonts.js b/src/main/fonts.ts
similarity index 70%
rename from src/main/fonts.js
rename to src/main/fonts.ts
index 03c977c6..345ca90b 100644
--- a/src/main/fonts.js
+++ b/src/main/fonts.ts
@@ -1,9 +1,9 @@
 import SystemFonts from 'system-font-families'
 
-const fonts = () => {
+const fonts = async (): Promise<Array<string>> => {
   const systemFonts = new SystemFonts()
   return systemFonts.getFonts()
-    .then(res => {
+    .then((res: string) => {
       return Array.from(new Set(res)).sort()
     })
 }
diff --git a/src/main/index.ts b/src/main/index.ts
index 82e1f13a..66922c15 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -801,7 +801,7 @@ ipcMain.on('remove-hashtag', (event, tag) => {
 })
 
 // Fonts
-ipcMain.on('list-fonts', (event, _) => {
+ipcMain.on('list-fonts', (event: Event, _) => {
   Fonts()
     .then(list => {
       event.sender.send('response-list-fonts', list)